fix(controller): refresh cloud/nat node interfaces from compute on GET

Cloud and NAT nodes need live host network interface data. Previously,
GET /projects/{project_id}/nodes/{node_id} returned cached properties
from creation time, so newly added host interfaces (e.g. kernel bridges
created by EthernetSwitch nodes) were invisible until the node was
deleted and recreated.

Now the controller fetches fresh data from the compute node before
returning the response, so host interface changes are reflected
immediately. Falls back to cached data if compute is unreachable.

gns3server/api/routes/controller/nodes.py

@@ -243,14 +243,25 @@ async def reload_all_nodes(project: Project = Depends(dep_project)) -> None:
             raise
 
 
+# Node types that need live host interface data from compute
+_HOST_INTERFACE_NODE_TYPES = {"cloud", "nat"}
+
+
 @router.get("/{node_id}", response_model=schemas.Node, dependencies=[Depends(has_privilege("Node.Audit"))])
-def get_node(node: Node = Depends(dep_node)) -> schemas.Node:
+async def get_node(node: Node = Depends(dep_node)) -> schemas.Node:
     """
     Return a node from a given project.
 
     Required privilege: Node.Audit
     """
 
+    if node.node_type in _HOST_INTERFACE_NODE_TYPES:
+        try:
+            response = await node.get()
+            await node.parse_node_response(response.json)
+        except Exception:
+            # If compute is unreachable, still return cached data
+            log.warning(f"Could not refresh node {node.id} from compute, returning cached data")
     return node.asdict()